Method of lubrication as applied to the processing of aluminum and aluminum alloys



Patented July 2, 1946 METHOD OF LUBRICATION AS APPLIED TO THE PROCESSING OF ALUMINUM AND ALUMINUM ALLOYS Fred E. Rosenstiehl, Westfield, N. J., assignor to The Texas Company, New York, N. Y., a corporation of Delaware No Drawing. Application February 2, 1944,

Serial No. 520,781 a 4 Claims. (Cl. 252-515) This invention relates to a lubricating composition adapted for use in the processing of aluminum and aluminum alloys. and particularly to a non-staining aluminum roll oil.

In the processing or rolling of aluminum and aluminum alloys into sheets and strips it is the usual practice to spray the rolls and working metal with a light mineral'oil to lubricate the rolls and prevent sticking of the working metal surface. After the final pass through the rolls, prior to annealing, this oil must be thoroughly removed from the metal surface. This step is of particular importance in the production of planished sheets and strips, due to'the fact that any oil remaining on the metal will result in a brown or black discoloration or stain on subsequent annealing. In general, annealing is carried out at temperatures ranging from 600 to 900 F. for two to five hours, depending upon the characteristics desired. Under these conditions,

any residual oil remaining on the metal surface is burned into the metal, leaving brown or black stainswhich are not removable.

It is the purpose of the invention to provide a lubricating composition which effectively lubricates the metal surfaces of the sheets and strips during the rolling operations and which, without I being removed therefrom, may pass through the annealing ovens without leaving an undesirable stain on themetal surface.

It has been found that a low viscosity mineral oil compounded with small amounts of the combmation of an oxidation product obtained by A partial oxidation of high molecular weight petroleum hydrocarbons and an oxidation-inhibitor falling within the class of N-substituted aromatic amines, provides a lubricating oil especially adapted to the lubrication of aluminum and aluminum-alloy metals during the processing or rolling thereof, and which, upon subsequent annealing of the metals, without undergoing an oil removal operation, will leave no oil stains on the surfaces of the working metal. In addition to the exceptional nonstaining characteristics,

the compounded oil possesses improved wetting and spreading properties which minimize scratching of the metal surfaces during the rolling operation, protects staining, and prevents metal pick-up on the rolls.

In accordance with the present invention a 50 by air-blowing.

against waternonstaining aluminum roll oil may be prepared.

by incorporating in a mineral oil, within the viscosity range of 35-100 Saybolt Universal seconds at 100 F., the combination of OBI-1.0% by weight of an oxidation product obtained'by partial oxidation of high molecular weight petroleum hydrocarbons, such as lubricating oils, petrolatum or wax, which are oxidized to a neutralization number not greater than and 0014570 by weight of an N-substituted aromatic amine, such as a phenyl naphthylamine, diaryl amine, diamino diaryl alkane, etc., which possesses-oxida tion inhibiting properties.

The preferred lubricating composition of the invention is composed of a mineral lubricating oil within the viscosity range of 40-60 Saybolt Universal seconds at E, which is compounded with 0.01-0.10% by weight of an oxidation product obtained by catalytic partial oxidation of petroleum wax to a neutralization number within the range of 20-50 and 0.05-0.5% by weight of a diamino diaryl alkane possessing oxidation inhibiting properties.

In orderto further disclose the invention, the following example is given, it being understood that the example is merely for purposes of illustration and the invention is not restricted thereto. I

1400 gallons of 300 oil, which is an acidtreated, doctor-sweetened burning oil distillate,

were blended in a kettle equipped with a steam jacket and airblowing facilities with 1475 gallons of car all stock T, whichis a causticwashed distillate blending stock.- The tests on these oils are as follows:

The resulting blend had a viscosity of approximately 46 Saybolt Universal seconds at 100 F. The blend was then heated by steam until the temperature reached F. Thereafter, the steam was cut off and the oil vigorously agitated 20.6 pounds of tetramethyl dicated by methyl-orange.

f aeoaaae circulating water through the jacket. The resulting product, containing 0.10% tetramethyl diamino diphenyl methane and 0.05% oxidized wax, possessed the following tests:

Gravity, API 32.6

Flash, C-C1eve., F- 285 Fire, Cleve, "F n 315 Visc. Saybolt Univ. secs. at 100 F 46.1 Carbon residue, percent 0.01

The oxidized wax component of the foregoing product was prepared by oxidizing a petrolatum stock from a solvent-dewaxed filtered wax distillate at 238-250 Ft, using 3 cu. ft, of air per hour per pound with 11% manganese naphthenate as a catalyst until the oxidized wax had a neutralization number of 28.8 anda saponification number of 73. treatment, using by volume of 40% sulfuric acid, followed by washing with hot water in which no inorganic acidity was present as in The catalyst-free oxidized wax was then steain-stripped under 0.6 inches absolute mercury pressure and a maxi-= mum oil pressure of 300 F. The oxidized wax so prepared analyzed as follows:

Neutralization No 26 Saponification No 64 Percent unsaponifiableu' 72 Ash, percent Trace The catalyst was removed by acid To determine the effectiveness of the various /a", which was polished to a mirror finish,was

used. 0.8 008. of the test oil was spread evenly over the'upper surface of the test platewith a rubber replacement. The coated test plate was then placed in an oven for a half hour at-340" C. (644 F.), At the end of this period, the plate was then removed and examined for stains. It was found that the oils of the invention all satis= factorily passed this so-called stain test with results ranging from a very slight stain to no stain at all.

Obviously many modifications and variations of the invention, as hereinbefore set forth, may be made without departing from the spirit and scope thereof, and therefore only such limitations 4 should be imposed as are indicated in the appended claims.

I claim:

1. a method of lubrication as applied to the processing 01 aluminum and aluminum alloys in which the metal is subjected to a rolling operation, followed by annealing, which comprises supplying to the rolls and metal surfaces a hydrocarbon lubricating oil withinthe viscosity range of 35-100 Saybolt Universal seconds at 100 F., having incorporated therein a combination of 0.01-1.0% by weight of an oxidation product obtained by the partial oxidation of high molecular weight petroleum hydrocarbons, and (Ll-1.5%

by weight of an N-substituted aromatic amino of the class consisting of phenyl naphthylamines,- diaryl amines, and diamino diaryl alkanes possessing oxidation inhibiting properties.

2. A. method of lubrication as applied to the processing of aluminum and aluminum alloys in which the metal is subjected to a rolling operation, followed by annealing, which comprises supplying to the rolls and metal surfaces s. hydrocarbon lubricating oil within the viscosity range 01 35-100 Saybolt Universal seconds at 100 F., having incorporated therein a combination of 0.01-1.0% by weight of an oxidation product obtained by the partial oxidation of high molecu-' lar weight petroleum hydrocarbons which are oxidized to a neutralization number not greater than 70, and0.11.5% by weight of an N-substituted aromatic amine of the class consistin of phenyl naphthylamines,'diaryl amines, and diamino diaryl alkanes possessing oxidation inhibiting properties.

3. A method of lubrication as' applied to the processing of aluminum and aluminum alloys in which the metal is subjected to a rolling operation, followed by annealing, which comprises supplying to the rolls and metal surfaces a hydrocarbon lubricating oil within the viscosity range of 35100 Saybolt Universal seconds at 100 F.,

having incorporated therein a combination of '0.01-1.0% by weight of an oxidation product obtained by the partial oxidation of high molecular weight petroleum hydrocarbons, and 0.1-1.5% by weight of a diamino diaryl alkane possessin oxidation inhibiting properties.

4. A method .of lubrication as applied to the processing of aluminum and aluminum alloys in which the metal is subjected to a rolling operation, followed by annealing, which comprises supplying to the rolls and metal surfaces ahydrocarbon lubricating oil within the viscosity range 0d 35-100 Saybolt Universal seconds at F., having incorporated therein a combination of 0.01-1.0% by weight of an oxidized petroleum wax, and 0.1-1.5% by weight of tetramethyl diamino diphenyl methane.

' FRED E. ROSENSTIEHL. 

